A372928 - cp's OEIS frontend

A372928 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, x_3, n)^3.

n	a(n)
1	1
2	15
3	53
4	176
5	249
6	795
7	685
8	1856
9	2133
10	3735
11	2661
12	9328
13	4393
14	10275
15	13197
16	18432
17	9825
18	31995
19	13717
20	43824
21	36305
22	39915
23	24333
24	98368
25	46625
26	65895
27	76545
28	120560
29	48777
30	197955
31	59581
32	176128
33	141033
34	147375
35	170565
36	375408
37	101305
38	205755
39	232829
40	462144

[1, 15, 53, 176, 249, 795, 685, 1856, 2133, 3735, 2661, 9328, 4393, 10275, 13197, 18432, 9825, 31995, 13717, 43824, 36305, 39915, 24333, 98368, 46625, 65895, 76545, 120560, 48777, 197955, 59581, 176128, 141033, 147375, 170565, 375408, 101305, 205755, 232829, 462144]

cp's OEIS Frontend

A372928 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, x_3, n)^3.

Table of values

List of values